Sometimes Stainless Isn't Enough

Posted by Tristian McCallion on Wed, Mar 15, 2017 @ 10:03 AM





Special Alloys are used in unique applications where stainless steel cannot hold up to the corrosive material.


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Swagelok carries an array of special alloys to meet our customers requirements, to find out more about special alloy uses download our Special Alloy catalogue.


How many materials can you get Swagelok tube fittings in? Two? Five?  Would you believe that our standard material list includes 16 different materials from nylon to titanium?

316 stainless is our most common material and is good for 95% of applications in northern Alberta but there are some limitations.

Special alloys

In the SAGD world on the water treatment side, there is often an elevated chlorine level in the boiler water.  Chlorine and stainless steels don’t mix well and it is common to find stress corrosion cracking in applications that have high chloride levels and stainless steel fittings and tubing.  There are a number of other materials that we offer that can provide the necessary corrosion resistance in this type of application, like Monel, or our high temperature carbon steel.

This is just one application where we are able to help out with special alloys.  Some of the other materials that we can provide include:

Teflon and PFA:  PFA is the injection moldable version of Teflon.  These materials provide for excellent chemical resistance to a wide range of different fluids.  Water treatment facilities are large users of PFA and Teflon fittings.

Alloy 400, or Monel:  This is a high nickel alloy that has excellent resistance to corrosion in reducing environments with fluids like hydrochloric, sulfuric and hydrofluoric acids.  It is also a commonly referenced material when looking at NACE specs.

Inconel 625: A very corrosion resistant in oxidizing and reducing media.  It offers high strength and good ductility.  It also has very good performance in sour gas (NACE MR0175)

Hastelloys:  C-276, C-22, B-2 are some of the grades that you can find, with C-276 being one of the more common alloys we deal with locally in this range.  It offers excellent resistance to pitting and crevice corrosion and immunity to stress corrosion cracking.

Duplex stainless steels:  A number of different materials are available here: 2205, 2507 super duplex and even the excitingly named 2707 hyper duplex stainless.  Often seen in offshore applications these materials have higher strength than 316 stainless and may have better resistance to pitting, crevice and general corrosion.

Swagelok makes fittings, valves and other components out of a wide range of different materials and would be happy to work on your applications with you.

Our Special Alloy catalogue provides additional information on some of the special alloys offered by Swagelok.


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Topics: local expert, Valves, Fittings